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f(-3) = 0 = (a-1)×(-3) + 3
-3 = -3a + 3
-6 = - 3 a
a = 2
Zad 2
0,4 szans - kura
więc 0,6 - kaczka
0,6 ----- 8
0,4 ------ x
0,6x=8 ×0,4
x = 3,2 : 0,6
x ≈ 5
Odp. Jest 5 kur